Back to results
US 4,047,980 AGranted
Processing chromium-containing precipitation hardenable copper base alloys
AssigneeOlin Corporation
InventorsW. Gary Watson, John F. Breedis
Life of this patent
Estimating the term…
Abstract
A process of heat treating and mechanically working chromium-containing precipitation hardenable copper base alloys is disclosed. The combination of hot and cold working, annealing and novel low temperature thermal treatment steps increases both the strength and electrical conductivity properties of the alloys without excessive cold working.
Claims16
A process for improving both the strength and electrical conductivity properties of copper base alloys, which comprises:
- a. casting a chromium-containing precipitation hardenable copper base alloy;
- b. hot working the alloy at a starting temperature of 950.degree.-1000.degree. C to effect the maximum solid solution of all alloying elements;
- c. rapidly cooling the alloy to maintain said maximum solid solution of all alloying elements;
- d. cold working the alloy to a total reduction of at least 60%;
- e. aging said alloy at 400.degree.-500.degree. C for one to 24 hours;
- f. cold working the alloy to a further total reduction of at least 50%;
- and
- g. aging said alloy at 150.degree.-250.degree. C for 1 to 24 hours.
5 more elements
A process for improving both the strength and electrical conductivity properties of copper base alloys, which comprises:
- a. casting a chromium-containing precipitation hardenable copper base alloy;
- b. hot working the alloy at a starting temperature of 850.degree.-950.degree. C;
- c. solution annealing the worked alloy at a solutionizing temperature of 950.degree.-1000.degree. C, for a period of time sufficient to insure the maximum solid solution of all alloying elements;
- d. rapidly cooling the alloy to maintain said maximum solid solution of all alloying elements;
- e. cold working the alloy to a total reduction of at least 60%;
- f. aging said alloy at 400.degree.-500.degree. C for one to 24 hours;
- g. cold working the alloy to a further total reduction of at least 50%;
- and
- h. aging said alloy at 150.degree.-250.degree. C for one to 24 hours.
6 more elements
Dependencies are inferred from the claim text.